diff --git a/src/sentry/options/defaults.py b/src/sentry/options/defaults.py
index a0cec5edffbf..504438976766 100644
--- a/src/sentry/options/defaults.py
+++ b/src/sentry/options/defaults.py
@@ -552,6 +552,14 @@
     flags=FLAG_AUTOMATOR_MODIFIABLE,
 )
 
+# Threshold for inlining attachments in relay.
+register(
+    "relay.attachment-inline.limit",
+    type=Int,
+    default=0,
+    flags=FLAG_AUTOMATOR_MODIFIABLE,
+)
+
 # Rollout rate for double writing sessions to EAP.
 register(
     "relay.sessions-eap.rollout-rate",
diff --git a/src/sentry/relay/globalconfig.py b/src/sentry/relay/globalconfig.py
index 05a2e2aa7436..235c2cbf78eb 100644
--- a/src/sentry/relay/globalconfig.py
+++ b/src/sentry/relay/globalconfig.py
@@ -23,6 +23,7 @@
     "relay.drop-transaction-attachments",
     "relay.objectstore-attachments.sample-rate",
     "relay.endpoint-fetch-config.enabled",
+    "relay.attachment-inline.limit",
 ]